Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Base / MS / Internal / Security / RightsManagement / CallbackHandler.cs / 1 / CallbackHandler.cs
//------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // These are the internal helpers that used to process callbacks from RM SDK // // History: // 06/13/2005: IgorBel: Initial implementation. // //----------------------------------------------------------------------------- using System; using System.Threading; using System.Runtime.InteropServices; using System.Security; // Enable presharp pragma warning suppress directives. #pragma warning disable 1634, 1691 namespace MS.Internal.Security.RightsManagement { internal delegate int CallbackDelegate(StatusMessage status, int hr, IntPtr pvParam, // in the unmanaged SDK these 2 declared as void * IntPtr pvContext); // so the IntPtr is the right equivalent for both 64 and 32 bits // No need to synchronize access to these methods because they are only called on the user thread // This object is re-used during the same session which is why the event must be reset after the wait. // As a result of calling GC.SuppressFinalize(this) we also need to seal the class. As there is a danger // of subclass introducing it's own Finalizer which will not be called. ////// Critical: This class expose access to methods that eventually do one or more of the the following /// 1. call into unmanaged code /// 2. affects state/data that will eventually cross over unmanaged code boundary /// 3. Return some RM related information which is considered private /// [SecurityCritical(SecurityCriticalScope.Everything)] internal sealed class CallbackHandler : IDisposable { internal CallbackHandler() { _resetEvent = new AutoResetEvent(false); // initialized to a false non-signaled state _callbackDelegate = new CallbackDelegate(OnStatus); } internal CallbackDelegate CallbackDelegate { get { return _callbackDelegate; } } // this property is not to be accessed until WaitForCompletion returns internal string CallbackData { get { return _callbackData; } } // this is called from the user thread internal void WaitForCompletion() { _resetEvent.WaitOne(); // return to the reset state after unblocking current transaction (as it is an "Auto"ResetEvent) // second process possible managed exception from the other thread if (_exception != null) { // rethrow exception that was cought from a worker thread throw _exception; } Errors.ThrowOnErrorCode(_hr); } public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } // this is the callback from the RM thread private int OnStatus(StatusMessage status, int hr, IntPtr pvParam, IntPtr pvContext) { if (hr == S_DRM_COMPLETED || hr < 0) { _exception = null; // we are resetting this variable, so that the instance of this class will be reusable even after exception try { _hr = hr; // we are assigning hr first as the next command can potentially throw, and we would like to have hr value preserved if (pvParam != IntPtr.Zero) { _callbackData = Marshal.PtrToStringUni(pvParam); } } // disabling PreSharp false positive. In this case we are actually re-throwing the same exception // on the application thread inside WaitForCompletion() function #pragma warning disable 56500 catch (Exception e) { // We catch all exceptions of the second worker thread (created by the unmanaged RM SDK) // preserve them , and then rethrow later on the main thread from the WaitForCompletion method _exception = e; } #pragma warning restore 56500 finally { // After this signal, OnStatus will NOT be invoked until we instigate another "transaction" // from the user thread. _resetEvent.Set(); } } return 0; } private void Dispose(bool disposing) { if (disposing) { if (_resetEvent != null) { _resetEvent.Set(); ((IDisposable)_resetEvent).Dispose(); } } } private CallbackDelegate _callbackDelegate; private AutoResetEvent _resetEvent; private string _callbackData; private int _hr; private Exception _exception; private const uint S_DRM_COMPLETED = 0x0004CF04; //success code } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // These are the internal helpers that used to process callbacks from RM SDK // // History: // 06/13/2005: IgorBel: Initial implementation. // //----------------------------------------------------------------------------- using System; using System.Threading; using System.Runtime.InteropServices; using System.Security; // Enable presharp pragma warning suppress directives. #pragma warning disable 1634, 1691 namespace MS.Internal.Security.RightsManagement { internal delegate int CallbackDelegate(StatusMessage status, int hr, IntPtr pvParam, // in the unmanaged SDK these 2 declared as void * IntPtr pvContext); // so the IntPtr is the right equivalent for both 64 and 32 bits // No need to synchronize access to these methods because they are only called on the user thread // This object is re-used during the same session which is why the event must be reset after the wait. // As a result of calling GC.SuppressFinalize(this) we also need to seal the class. As there is a danger // of subclass introducing it's own Finalizer which will not be called. ////// Critical: This class expose access to methods that eventually do one or more of the the following /// 1. call into unmanaged code /// 2. affects state/data that will eventually cross over unmanaged code boundary /// 3. Return some RM related information which is considered private /// [SecurityCritical(SecurityCriticalScope.Everything)] internal sealed class CallbackHandler : IDisposable { internal CallbackHandler() { _resetEvent = new AutoResetEvent(false); // initialized to a false non-signaled state _callbackDelegate = new CallbackDelegate(OnStatus); } internal CallbackDelegate CallbackDelegate { get { return _callbackDelegate; } } // this property is not to be accessed until WaitForCompletion returns internal string CallbackData { get { return _callbackData; } } // this is called from the user thread internal void WaitForCompletion() { _resetEvent.WaitOne(); // return to the reset state after unblocking current transaction (as it is an "Auto"ResetEvent) // second process possible managed exception from the other thread if (_exception != null) { // rethrow exception that was cought from a worker thread throw _exception; } Errors.ThrowOnErrorCode(_hr); } public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } // this is the callback from the RM thread private int OnStatus(StatusMessage status, int hr, IntPtr pvParam, IntPtr pvContext) { if (hr == S_DRM_COMPLETED || hr < 0) { _exception = null; // we are resetting this variable, so that the instance of this class will be reusable even after exception try { _hr = hr; // we are assigning hr first as the next command can potentially throw, and we would like to have hr value preserved if (pvParam != IntPtr.Zero) { _callbackData = Marshal.PtrToStringUni(pvParam); } } // disabling PreSharp false positive. In this case we are actually re-throwing the same exception // on the application thread inside WaitForCompletion() function #pragma warning disable 56500 catch (Exception e) { // We catch all exceptions of the second worker thread (created by the unmanaged RM SDK) // preserve them , and then rethrow later on the main thread from the WaitForCompletion method _exception = e; } #pragma warning restore 56500 finally { // After this signal, OnStatus will NOT be invoked until we instigate another "transaction" // from the user thread. _resetEvent.Set(); } } return 0; } private void Dispose(bool disposing) { if (disposing) { if (_resetEvent != null) { _resetEvent.Set(); ((IDisposable)_resetEvent).Dispose(); } } } private CallbackDelegate _callbackDelegate; private AutoResetEvent _resetEvent; private string _callbackData; private int _hr; private Exception _exception; private const uint S_DRM_COMPLETED = 0x0004CF04; //success code } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- SafeReversePInvokeHandle.cs
- GroupStyle.cs
- ScrollBarAutomationPeer.cs
- TrackPointCollection.cs
- GridViewSortEventArgs.cs
- SoapCodeExporter.cs
- XmlTextWriter.cs
- TextComposition.cs
- RegionIterator.cs
- AsyncStreamReader.cs
- StaticExtensionConverter.cs
- TransactionManager.cs
- DiagnosticTrace.cs
- ActivityIdHeader.cs
- SqlClientWrapperSmiStreamChars.cs
- _AutoWebProxyScriptWrapper.cs
- EntityDataSourceValidationException.cs
- NamedElement.cs
- SimpleWorkerRequest.cs
- HwndProxyElementProvider.cs
- ButtonChrome.cs
- WindowsListBox.cs
- SiteMapPathDesigner.cs
- StrokeNodeOperations.cs
- HttpWebRequestElement.cs
- XmlDictionary.cs
- EntryPointNotFoundException.cs
- CodeActivityContext.cs
- EntityContainer.cs
- ExceptionNotification.cs
- Identity.cs
- OdbcDataReader.cs
- GcSettings.cs
- DateTimeOffsetStorage.cs
- IndentTextWriter.cs
- ProgressBar.cs
- ServicesUtilities.cs
- TextDecorationCollectionConverter.cs
- PropertyFilterAttribute.cs
- ImagingCache.cs
- QuadraticEase.cs
- XmlTextWriter.cs
- XmlMapping.cs
- XmlNamespaceMappingCollection.cs
- StreamGeometry.cs
- ChangePassword.cs
- ColorConverter.cs
- LicenseManager.cs
- RemotingService.cs
- FixedElement.cs
- OperationBehaviorAttribute.cs
- TouchFrameEventArgs.cs
- LazyLoadBehavior.cs
- CookieHandler.cs
- SpellerError.cs
- XmlSchemaComplexType.cs
- ReflectEventDescriptor.cs
- DesignerCapabilities.cs
- FacetDescriptionElement.cs
- WindowHideOrCloseTracker.cs
- SpellerInterop.cs
- EncoderExceptionFallback.cs
- RegexCompilationInfo.cs
- ContentElement.cs
- RtfControlWordInfo.cs
- SqlLiftIndependentRowExpressions.cs
- Vector3DValueSerializer.cs
- CodeMemberField.cs
- ListChangedEventArgs.cs
- UnsafeNativeMethods.cs
- XmlEncodedRawTextWriter.cs
- FixedHighlight.cs
- UnlockInstanceAsyncResult.cs
- ToolStripMenuItemCodeDomSerializer.cs
- DefaultConfirmation.cs
- MgmtConfigurationRecord.cs
- CacheSection.cs
- GenericAuthenticationEventArgs.cs
- BinaryWriter.cs
- InheritanceContextChangedEventManager.cs
- ToolStripTextBox.cs
- OperatingSystemVersionCheck.cs
- FilterUserControlBase.cs
- HttpCachePolicyBase.cs
- Security.cs
- FileIOPermission.cs
- HttpPostedFile.cs
- SafeNativeMethods.cs
- DataViewManager.cs
- DataGridViewDataErrorEventArgs.cs
- RenderTargetBitmap.cs
- LoadMessageLogger.cs
- QueryStatement.cs
- Suspend.cs
- ActivityMarkupSerializer.cs
- OleDbDataAdapter.cs
- TimeSpanValidatorAttribute.cs
- ImageResources.Designer.cs
- DataGridViewSelectedRowCollection.cs
- SerializerWriterEventHandlers.cs